DALLAS -- National restaurant chain Chili's confirmed over the weekend that customer data for an unknown number of diners may have been stolen as part of a data breach.

In a statement released by the company, it says "we believe that malware was used to gather payment card information including credit or debit card numbers as well as cardholder names from our payment-related systems," but did not say which restaurants or how many people were affected by the breach.

"Chili's does not collect certain personal information (such as social security number, full date of birth, or federal or state identification number) from Guests," reads the statement. "Therefore, this personal information was not compromised."

The company says it is working with law enforcement on the issue and a third party to determine the scope of the breach.

In the meantime, the company is asking customers who used a credit or debit card at one of their restaurants in March or April to be vigilant for any unknown transactions made on those accounts.

Chili's says there's no reason to cancel any of those cards, but if you notice a unauthorized charge, you should contact the financial institution immediately. The company also says they believe it's safe to use your card at any Chili's location now that the breach has been discovered.

"We sincerely apologize to those who may have been affected and assure you we are working diligently to resolve this incident," the statement reads.